Pump device

Abstract

A pump device according to one embodiment includes a pump and a symbol. The pump includes at least one pump structure and a suction port, wherein a displacement of the at least one pump structure, the displacement being a delivery amount per rotation, changes in accordance with a command current. The symbol is displayed on a surface of the pump, the surface facing in a direction different from a direction in which the suction port is open. The symbol stores actual measurement data or save location information on the actual measurement data, the actual measurement data indicating an actual relationship between the command current and the displacement of the at least one pump structure.

What is claimed is: 
     
         1 . A pump device comprising:
 a pump including at least one pump structure and a suction port, wherein a displacement of the at least one pump structure, the displacement being a delivery amount per rotation, changes in accordance with a command current; and   at least one symbol that is displayed on a surface of the pump, the surface facing in a direction different from a direction in which the suction port is open, the at least one symbol storing actual measurement data or save location information on the actual measurement data, the actual measurement data indicating an actual relationship between the command current and the displacement of the at least one pump structure.   
     
     
         2 . The pump device according to  claim 1 , wherein
 the at least one pump structure includes two pump structures,   the at least one symbol includes two symbols corresponding to the two pump structures, respectively, and   each of the symbols stores the actual measurement data, or the save location information on the actual measurement data, of a corresponding one of the pump structures.   
     
     
         3 . The pump device according to  claim 1 , wherein
 the at least one pump structure includes two pump structures, and   the pump is a tandem pump in which the two pump structures are located in tandem.   
     
     
         4 . The pump device according to  claim 1 , wherein
 the at least one pump structure includes two pump structures, and   the pump is a parallel pump in which the two pump structures are located in parallel.   
     
     
         5 . The pump device according to  claim 1 , wherein
 the at least one pump structure is of an axial piston type.   
     
     
         6 . The pump device according to  claim 5 , wherein
 the at least one pump structure includes:
 a cylinder block that holds pistons in a slidable manner; and 
 a container-shaped casing that accommodates the cylinder block, 
   the pump includes a valve cover that seals an opening of the casing, and   the suction port is located on the valve cover.